Displacement boats make a big wake just like planing boats. The water has to move somewhere. Look at any picture of a moving ship and the wake is clear. Displacement wakes are just smoother, without the breaking waves.
As to her speed, in NH at least:
Saf-C 401.18 "No wake area" means an area where all boats are required to operate at headway speed
further:
Saf-C 401.08 "Headway speed" means 6 miles per hour or the slowest speed that a boat can be operated and maintain steerage way.
If the Mount's skipper cannot maintain steerage and control of his vessel at 6 mph, he can go faster.
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